How much protein should i eat to gain muscle?

It is recommended to intake 1 gram of protein per pound of body weight per day to start building muscle.
If you plan to do more frequent/high intensity work outs and/or plan to lose weight, increase your protein intake to about 1.2-1.5 grams of protein per pound of body weight per day.
When you do start to get more lean, keeping your protein intake high is essential, or you might start to lose muscle mass. To prevent this, make sure to get at least 1 gram of protein per pound of body weight each day.